fio使用

关于lat(I/O completion latency)、clat(complete latency)、slat(summit latency):app

lat is the total latency. slat is the time it takes to submit the
IO to the kernel, clat is the time from when slat is over and until the
device has completed it (and the application is notified). Hence lat is
slat + clat.

一、rw_sequencerdom

identical或者sequentialide

如rw=randread:8 这样每8次io就更改一次offset。那么这个rw_sequencer控制在这8次的io时的offset。debug

二、#!/usr/local/bin/fio  --debug=ioit

使用debug选项能够看到它的io的详细状况io

三、rw=randread:51200file

表示每51200次io从新取offsetservice

四、file_service_type=random:51200bug

表示每51200次io从新随机取下一个文件im

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